Question

simplifique as expressoes em seu caderno
a) (2×+3)²-×(×-4)
b) (9y+1)²-(y+9)²
c) (1+5a)²+25(1-a²)
respostas???

Answer 1

a) (2×+3)²-×(×-4)
    (2x+3)*(2x+3)-x(x-4)  
    4x^2+12x+9-x^2-4x
    3x^2+8x+9

b) (9y+1)²-(y+9)²
    (9y+1)*(9y+1)-(y+9)*(y+9)
    81y^2+18y+1-y^2+18y+81
    80y^2+36y+82

c) (1+5a)²+25(1-a²)
    (1+5a)*(1+5a)+25+25a^2
    1+10a+25a^2+25+25a^2
     50a^2+10a+25